//参数说明:
//LPSTR lpDIBBits - 指向源DIB图像指针
//LONG lWidth - 源图像宽度（象素数，必须是4的倍数）
//LONG lHeight - 源图像高度（象素数）
/
//函数说明:
//该函数用来对BlurDIB()生成的DIB图像进行复原操作。
BOOL WINAPI RestoreDIB (LPSTR lpDIBBits, LONG lWidth, LONG lHeight)
{
// 指向源图像的指针
LPSTR lpSrc;
//循环变量
long i;
long j;
//像素值
unsigned char pixel;
// 图像每行的字节数
LONG lLineBytes;
//用于做FFT的数组
double *fftSrc,*fftKernel;
double a,b,c,d;
//二维FFT的长度和宽度
unsigned long nn[3];
//图像归一化因子
double MaxNum;
// 计算图像每行的字节数
lLineBytes = WIDTHBYTES(lWidth * 8);
double dPower = log((double)lLineBytes)/log(2.0);
if(dPower != (int) dPower)
{
return false;
}
dPower = log((double)lHeight)/log(2.0);
if(dPower != (int) dPower)
{
return false;
}
fftSrc = new double [lHeight*lLineBytes*2+1];
fftKernel = new double [lHeight*lLineBytes*2+1];
nn[1] = lHeight;
nn[2] = lLineBytes;
for (j = 0;j < lHeight ;j++)
{
for(i = 0;i < lLineBytes ;i++)
{
// 指向源图像倒数第j行，第i个象素的指针
lpSrc = (char *)lpDIBBits + lLineBytes * j + i;
pixel = (unsigned char)*lpSrc;
fftSrc[(2*lLineBytes)*j + 2*i + 1] = (double)pixel;
fftSrc[(2*lLineBytes)*j + 2*i + 2] = 0.0;
if(i < 5 && j == 0)
{
fftKernel[(2*lLineBytes)*j + 2*i + 1] = 1/5.0;
}
else
{
fftKernel[(2*lLineBytes)*j + 2*i + 1] = 0.0;
}
fftKernel[(2*lLineBytes)*j + 2*i + 2] = 0.0;
}
}
//对源图像进行FFT
fourn(fftSrc,nn,2,1);
//对卷积核图像进行FFT
fourn(fftKernel,nn,2,1);
for (j = 0;j < lHeight ;j++)
{
for(i = 0;i < lLineBytes ;i++)
{
a = fftSrc[(2*lLineBytes)*j + 2*i + 1];
b = fftSrc[(2*lLineBytes)*j + 2*i + 2];
c = fftKernel[(2*lLineBytes)*j + 2*i + 1];
d = fftKernel[(2*lLineBytes)*j + 2*i + 2];
if (c*c + d*d > 1e-3)
{
fftSrc[(2*lLineBytes)*j + 2*i + 1] = ( a*c + b*d ) / ( c*c + d*d );
fftSrc[(2*lLineBytes)*j + 2*i + 2] = ( b*c - a*d ) / ( c*c + d*d );
}
}
}
//对结果图像进行反FFT
fourn(fftSrc,nn,2,-1);
//确定归一化因子
MaxNum = 0.0;
for (j = 0;j < lHeight ;j++)
{
for(i = 0;i < lLineBytes ;i++)
{
fftSrc[(2*lLineBytes)*j + 2*i + 1] =
sqrt(fftSrc[(2*lLineBytes)*j + 2*i + 1] * fftSrc[(2*lLineBytes)*j + 2*i + 1]\
+fftSrc[(2*lLineBytes)*j + 2*i + 2] * fftSrc[(2*lLineBytes)*j + 2*i + 2]);
if( MaxNum < fftSrc[(2*lLineBytes)*j + 2*i + 1])
MaxNum = fftSrc[(2*lLineBytes)*j + 2*i + 1];
}
}
//转换为图像
for (j = 0;j < lHeight ;j++)
{
for(i = 0;i < lLineBytes ;i++)
{
// 指向源图像倒数第j行，第i个象素的指针
lpSrc = (char *)lpDIBBits + lLineBytes * j + i;
*lpSrc = (unsigned char) (fftSrc[(2*lLineBytes)*j + 2*i + 1]*255.0/MaxNum);
}
}
delete fftSrc;
delete fftKernel;
// 返回
return true;
}
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